66404457 has 36 divisors (see below), whose sum is σ = 112157760. Its totient is φ = 37858968.

The previous prime is 66404453. The next prime is 66404483. The reversal of 66404457 is 75440466.

66404457 is a `hidden beast` number, since 6 + 640 + 4 + 4 + 5 + 7 = 666.

66404457 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66404457 - 2² = 66404453 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66404453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 151044 + ... + 151482.

Almost surely, 2^66404457 is an apocalyptic number.

It is an amenable number.

66404457 is a deficient number, since it is larger than the sum of its proper divisors (45753303).

66404457 is an frugal number, since it uses more digits than its factorization.

66404457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480 (or 449 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 36.

The square root of 66404457 is about 8148.8929923027. The cubic root of 66404457 is about 404.9478305001.

The spelling of 66404457 in words is "sixty-six million, four hundred four thousand, four hundred fifty-seven".